Grinding-mill.



R. N. BAILEY.

GRINDING MILL.

APPLICATION rnnn 12.12, 1913 Patented Jan. 5, 1915.

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UNITED STATES PATENT OFFICE.

RAYMOND NICELY BAILEY, 0F MUNCY, PENNSYLVANIA.

GRINDING-MILL.

Application filed March 12, 1913.

To all whom it may concern:

Be it known that I, RAYMOND N. BAILEY, a citizen of the United States,residing at Muncy, in the county of Lycoming and State of Pennsylvania,have invented certain new and useful Improvements in Grinding-Mills; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in grinding mills, and isparticularly concerned with mills of the attrition type.

The main and primary object of the present invention is to improve thegeneral construction and efficiency of attrition mills by the inclusiontherein of simple means to prevent the choking of the material as itfeeds from the spout into and through the eye of the open runner head,and, furthermore, to so construct such means that there shall be apositive feed of the material in its transit to the grinding plates.

As a further object of the invention, the latter also contemplates sucha combination and correlation of parts, incident to the provision of thefeeding means, as to provide a receiving pocket or chamber ofcomparatively large area, at the base of the spout, thereby enabling thematerial to feed into the eye of the runner head with ease and facility,and without liability of undue accumulation at the base of the spout.

Having, therefore, these general objects in view, and others which willappear as the nature of the invention is better understood, theimprovements reside in the novel combination and arrangement of partshereinafter fully described, illustrated in the accompanying drawings,and pointed out in the appended claims.

In the drawings, wherein is illustrated a vertical transverse sectionalview of an attrition grinding mill embodying the hereindescribedinvention, the numeral 10 designates the mill casing within which isarranged a solid runner head 11, which head is carried by a rotatableshaft 12 which may be driven in the usual manner, and also arranged inthe casing 10 is an open runner head 13 the hub 14 of which issubstantially cylindrical and is carried by a rotatable shaft 15 inalinement with the shaft 12, but adapted to rotate in an oppositedirection to that of said shaft 12. The means Specification of LettersPatent.

Patented Jan. 5, 1915.

Serial No. 753,743.

for driving the shaft 15 are those commonly found in mills of this kind.

At one side of the casing 10 is the usual feed spout 16, the lower endof which discharges through an opening in the side of the casing 10, andinterposed between the discharge end of said spout 16 and the openrunner head 13 are juxtaposed sealing rings 17, whereby the ungroundmaterial is prevented from passing from the spout into the casing 10without first passing between the runner heads. These latter are provided with the usual grinding plates 18.

To accomplish the recited objects of the present invention, the usualconstruction of the open runner head 13 is modified, and to this end thebody of said head is arranged in relation to the hub 14 thereof so as tobe positioned at a point substantially midway the ends of said hub andis thereby removed from the inner end of the latter. Hence, the innerend of the hub 14 is projected into the casing 10 to a greater extentthan the plane occupied by the body of the head 13, and said body isconnected to said hub by radial arms 19 which are curved in thedirection of the length of the hub 14. The curvature of the arms 19 ismost pronounced, and is of suflicient degree to cause the arms to spanthe space between the runner heads 11 and 13, and said arms 19 extendfrom the inner end of the hub 14 backwardly to the body portion of thehead 13, thus positioning the body portions of said arms in the spacebetween the runner heads, as indicated. To permit this positioning ofthe arms 19, the inner face of the solid head 11 has a recess 20 formedtherein, into which recess the inner end of the hub 14 projects, andthus extends to a point beyond the middle of the space between therunner heads. Vhen, therefore, the material passes into the eye of theopen runner head 13, it is drawn by centrifugal force into the path ofrotation of the arms 19, and these latter beat the material outwardly ina radial direction, throwing the same toward the grinding plates 18, andthus serving to always clear the eye of the open runner head, andpreventing this eye becoming choked. The rim of the eye to which thearms or spokes 19, are attached, is provided with a sloping wall as at19*. It will be noted that when the runner heads 11 and 13 are faced inoperative position, the construction is such as to provide a centrallylocated cavity.

By the curved formation of the arms 19, and the positioning of theirinner ends at the inner end of the hub 14, a receiving pocket 21 ofcomparatively large area is formed between the rear edges of the arms 19and the base of the spout 16, so that the material which feeds from thespout 16 by gravity passes into the eye of the runner head with ease andfacility, and reduces liability of accumulation at the base of the spoutto a minimum. In this connection it will be observed that the outer orrear edges of the arms 19 extend in a diagonal line from the outer wallof the open runner head to the hub 14 thereof, and are, therefore,offset with respect to the plane of the outer wall of the open runnerhead, the pocket 21 thereby extending into the body of said open runnerhead.

From the foregoing description the operation will be readily seen, andbriefly stated is as follows: The material to be ground gravitatesthrough the spout 16, and discharges into the casing 10 through the opencontiguous side of the same. The runner heads 11 and 13 being driven inopposite directions, the material is drawn by centrifugal force throughthe eye of the open runner head, and being caught by the rotating curvedarms 19 is thrown outwardly thereby to the grinding plates 18-, wherepulverization takes place, or the breaking up of the material iseffected to the desired extent. As the material passes from the spout 16it is received by the pocket 21, and by reason of the dimensions of thelatter choking of the material is avoided. Free passage, therefore, ofthe material through the eye of the open runner head is insured. Thus,choking of the material is avoided, and by the curved formation 01' thearms 19, which remove them to a maximum extent from the base of thespout 16, the material is prevented from being blown back and up throughthe spout 16 by the windage of said arms.

Having thus described the invention, What is claimed as new, and desiredto be secured by Letters Patent, is:

1. As an article of manufacture, a runner head for an attrition millcomprising a body portion having an eye formed in the center thereof, ahub in the middle of said eye,

and spokes extending diagonally from the rim of said eye inwardly tosaid hub thereby providing av recess between said hub and said spokes.the recess being deepest adjacent said hub.

2. As an article of manufacture, a runner head for an attrition millcomprising a body portion with an eye, a hub in the middle of said eye,spokes having their axes extending at substantially forty-five degreesto the axis of rotation of said runner head, said spokes being undercutadjacent said hub to enable the material surrounding said hub to feedaxially substantially to the plane of the grinding face beforeencountering any obstructions.

3. An attrition mill comprising in combination, a closed runner headadapted to be rotated in one direction, a grinding face carried by saidclosed runner head, said closed runner head being provided with adepression having sloping walls, an open runner head adapted to rotatein the opposite direction, said open runner head also having slopingwalls, said runner heads when in operative relation thereby forming acentrally located cavity, and substantially fiat spokes extending acrosssaid cavity and rotating directly in the grinding plane to encountermaterial and throw the same outwardly into the zone of action of thegrinding faces.

4. In an attrition mill in combination, a closed runner head providedWith a eentrally located cavity, a grinding member on said head, an openrunner head including a hub extending across the cavity of the closedrunner head, and spokes extending diagonaliy from the end of said hub tothe rim of the eye in the open runner head, said spokes crossing thegrinding plane and having a portion of their surfaces acting as drivingmembers to positively rotate ma terial fed into the mill and to throwthe material outwardly into the zone of the grinding members.

In testimony whereof I affix my signature, in the presence of twoWitnesses,

RAYMOND NICELY BAILEY.

Witnesses THOMAS WVoon, H. R. CLARKE.

topic: of thin patent may be obtained for five cents each. by addressingthe Commissioner of Patents, Washington, .D. 0.

